TABLE 1.
Body weight and body composition of rats fed a control diet or 1 of 4 low-protein diets with different phosphorus concentrations for 9 wk1
| Variable | LP-0.015P (n = 9) | LP-0.056P (n = 10) | LP-0.1P (n = 10) | LP-0.3P (n = 10) | NP-0.3P (n = 10) | ANOVA P value |
|---|---|---|---|---|---|---|
| Initial body weight, g | 266.1 ± 35.7 | 265.4 ± 32.8 | 266.5 ± 27.6 | 267.8 ± 24.2 | 266.9 ± 31.9 | 1.000 |
| Final body measurements | ||||||
| Weight, g | 383 ± 42.6a | 426 ± 39.5a | 513 ± 50.6b | 536 ± 76.7b | 563 ± 60.6b | <0.001 |
| Water | ||||||
| g | 224.4 ± 25.6a | 237.1 ± 21.4a,c | 261.1 ± 22.4a,b | 253.5 ± 17.8b,c | 277.1 ± 19.5d | <0.001 |
| % | 65.4 ± 2.1a | 62.4 ± 3.7a,b | 57.2 ± 6.3b,c | 53.9 ± 9.7c | 55.1 ± 5.6c | <0.001 |
| Fat | ||||||
| g | 24.9 ± 9.4a | 33.8 ± 15.8a,b | 56.6 ± 32.1b,c | 64.9 ± 37.7c | 56.4 ± 21.2a,b | 0.006 |
| % | 20.6 ± 5.0 | 23.1 ± 6.1 | 27.3 ± 8.6 | 26.7 ± 8.5 | 24.2 ± 5.3 | 0.230 |
| Defatted | ||||||
| g | 94.5 ± 9.9a | 110.1 ± 14.9a | 142.7 ± 22.5b | 163.2 ± 46.7b,c | 174.0 ± 33.7c | <0.001 |
| % | 14.0 ± 3.7a | 14.5 ± 3.9a | 15.5 ± 5.6a,b | 19.5 ± 5.6b,c | 20.8 ± 5.4c | 0.010 |
| Liver | ||||||
| Weight | ||||||
| g | 12.0 ± 2.1a | 12.5 ± 1.9a | 15.3 ± 2.4b | 16.4 ± 3.3b | 16.3 ± 2.3b | <0.001 |
| g/100 g | 3.3 ± 0.4 | 3.1 ± 0.3 | 3.2 ± 0.4 | 3.2 ± 0.2 | 3.09 ± 0.2 | 0.545 |
| Water, % | 72.2 ± 1.5 | 71.1 ± 2.2 | 70.5 ± 1.6 | 70.7 ± 1.3 | 70.7 ± 1.0 | 0.187 |
| Fat, % | 8.0 ± 2.0 | 13.1 ± 5.9 | 11.0 ± 3.6 | 11.9 ± 6.5 | 11.0 ± 2.7 | 0.186 |
1
Values are means ± SDs. One-factor ANOVA was used to detect significant differences between groups. Significance was set at P < 0.05. Categories in the same row that do not share the same superscript letters are significantly different. LP-0.015P, 10% protein and 0.015% P; LP-0.056P, 10% protein and 0.056% P; LP-0.1P, 10% protein and 0.1% P; LP-0.3P, 10% protein and 0.3% P; NP-0.3P, 20% protein and 0.3% P (control group).